#include<bits/stdc++.h> using namespace std; int main() { char a[1500]; char b[100] = {'h','e','l','l','o'}; cin>>a; int count = 0; for(int i=0;i<strlen(a);i++) { if(a[i] == b[count]) { count++; } } if(count == 5) { cout<<"YES"; } else { cout<<"NO"; } return 0; }